Methods and Materials: The standard of care in my practice and most practices is to have arthroplasty patients return for an annual clinical and radiographic evaluation. We are asking our patients that choose to enroll in the study to simply return for routine "standard of care" follow up. The only deviation from this standard of care is the method by which we obtain the xrays. In this study we will obtain true AP (anterior/posterior) and axillary views on there return visit. These are our normal "standard of care" xrays. The only difference is that we are going to obtain these Xrays using fluoroscopic guidance. The reason we are using fluoroscopic guidance is that we want to make sure that the xrays are perfect with the beam oriented tangential to the backside of the glenoid. This will allow us to see any lucencies behind the glenoid and allow us to truly assess for any loosening. Standard Xrays attempt to have the beam oriented tangential to the glenoid but just small deviations can underestimate any potential lucent lines. This will expose the study subjects to small amounts of radiation that would be outside the "standard of care". The patients will be informed of this and the dose recorded. The fluoroscopy procedure will take about 15-20 minutes, but the total radiation exposure for the activities performed will be up to, but not more than three minutes. The total radiation will be less than 3 rem. A licensed radiology technologist (RT) employed by the hospital will perform the fluoroscopy procedures and the Xrays. Jeff Jarnagin PA or Edwin Spencer MD will be present at all times during the fluoroscopy procedure. Both Dr Spencer and Jeff Jarnagin have been involved in other similar studies and have completed "training in human research subject protection". Subjects will be provided proper shielding (lead apron) throughout the activities. The licensed radiology technologist at the hospital will have the final responsibility for providing proper shielding.